Method and apparatus for producing uniform pulp yields by controlling the operation of a refiner
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United States of America Patent
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-
Dec 12, 1989
Grant Date -
N/A
app pub date -
Dec 16, 1987
filing date -
Dec 16, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for producing uniform pulp yields, wherein at least a refiner is controlled in accordance with the UV absorbance of the lignin dissolved in the digester cooking liquor, thereby to produce for a given quantity of wood chips a uniform pulp yield. A backflow control valve is automatically adjusted to maintain uniform flow of a sample of the digester cooking liquor through a UV analyzer, and a flushing arrangement is provided for flushing out contaminates such as sulphur dioxide from the system. Preferably the refiner is of the two-stage type, the first stage being automatically adjusted as a function of the UV absorbance of the digester cooking liquor, and the second stage being automatically adjusted as a function of the freeness of the output fiber slurry. Also, one or more of the cooking parameters is controlled by the UV analyzer to control the fiber yield.
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